Hours: 07–23 daily
EN
Tune your file

TuningBot DTC Database · v4.37.15

U1400 Diagnostic Trouble Code (3 interpretations)

3 manufacturer-specific interpretations across 2 manufacturers in the TuningBot DTC database.

U · NetworkBatteryOBD2
Brand pages:PSAVAG

PSA

2 interpretations
U1400
Alternator LIN network : Registering of a fault on the LIN network PSA · battery Data confidence 72%

The control module detected the fault condition "Registering of a fault on the LIN network" for the Alternator LIN network. Documented for the Continental SID 807 injection ECU (DV6C 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

Applies to Peugeot Continental SID 807 injection ECU (DV6C 1.6 HDi)
U1400
Alternator LIN network : Recording of a fault on the LIN network PSA · battery Data confidence 72%

The control module detected the fault condition "Recording of a fault on the LIN network" for the Alternator LIN network. Documented for the Delphi DCM 3.5 injection ECU (DW10C 2.0 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

Applies to Peugeot Delphi DCM 3.5 injection ECU (DW10C 2.0 HDi)

VAG

1 interpretation
U1400
Function Restricted due to Insufficient Voltage VAG · network Data confidence 80%

The control module detected a response consistent with a blocked or restricted Function. This is the manufacturer-specific definition used by Volkswagen. Volkswagen Group tools also report it as fault code 31896. Documented across Volkswagen Group applications (Audi, SEAT and Škoda included).

Symptoms

System Malfunction

Possible causes

Battery Voltage too Low

Recommended checks

  • Check/Replace Fuse(s)
  • Check/Replace Battery
  • Check/Replace Generator
Applies to Volkswagen

Related and nearby codes

U14 range
U1401U1403U1411U1412U1413U1417U1418U1440U1441U1442U1443U1444U144FU1451

How to read U1400

U

Network: communication between control units.

1

Manufacturer-defined range: the meaning can differ between brands.

400

Specific fault index within the subsystem.

Frequently asked questions about U1400

What does U1400 mean?

Diagnostic Trouble Code (3 interpretations). The control module detected the fault condition "Registering of a fault on the LIN network" for the Alternator LIN network. Documented for the Continental SID 807 injection ECU (DV6C 1.6 HDi) on Peugeot applications; the same PSA control units are also fitted to Citroën models.

Is U1400 generic or manufacturer-specific?

U1400 is a manufacturer-specific code. In this database it is documented for: PSA, VAG. The same number can mean something different on other brands.

Can TuningBot remove U1400 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U1400 is removable in your case.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database